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anhydrite-stone

SRI Petrography ID: 66

Names

[de]

Anhydrit

[en]

anhydrite-stone

Description

Anhydrite is a compact, transparent, white, grey or blueish mineral
of anhydrous calcium sulfate (CaSO4). Anhydrite differs from gypsum
by having no crystal-water and being harder (2.5). It can easily be
scratched by fingernails.
Anhydrite is sometimes a rock-forming mineral, building up the rock
type “anhydrite”. Anhydrite usually occurs as layers in gypsum
deposits in association with limestone, dolomite, and salt
beds.

Color

colorless, white, gray or blue coloured

Grain Size

fine grained

Texture

massive, dense, banded

Minerals

anhydrite, salt minerals, gypsum, sometimes clay minerals

Occurences

worldwide, first described in the salt deposit of Hall in Tirol
(Austria)